1. Orion Telecom Networks Inc. 2005 VCL-LD™ T1, Digital Voice Compression Equipment (Digital Circuit Multiplication Equipment - DCME) Slide 1 Updated : January 1st, 2005 16810, Avenue of Fountains, Suite # 108, Fountain Hills, AZ 85268, U.S.A. Phone: +1 (480) 816-8672 Fax: +1 (480) 816-0115 E-mail: sales@oriontelecom.comsales@oriontelecom.com Web Site: http://www.oriontelecom.comhttp://www.oriontelecom.com

2. Orion Telecom Networks Inc. 2005 Introduction VCL-LD TM T1, DCME (Digital Circuit Multiplication Equipment) Voice Compression Equipment. Provides 24, "toll quality" voice channels using an 6:1 compression ratio (8:1 Compression Ratio without the signaling channel), in a bandwidth of 256kbps*. This is accomplished using an advanced digital signal processor (DSP) based Virterbi decoder with automatic voice/silence detection (VAD) and adaptive comfort noise generation (CNG). ITU-T G.703, G.704 interface compliant. T1 signaling support for R2, CAS (ABCD) Digital Signaling, PRI ISDN (Q.931), SS7 and C7 Signaling. Proven to outperform CELP, RELP, VSELP, MELP, ECELP, MP-MLQ, LPC-10 and other competitive technologies. VCL-LD, T1 Voice Compression Equipment Highlights T1, 24 Toll-Quality voice channels in 256Kbps of bandwidth. 6:1 compression ratio (8:1 without signaling channel). Support fax and data modems @ upto 33.6Kbps data rates. 128 ms. adaptive Echo Cancellation. DSP based Vertibi Decoder for superior voice quality. 3U high, compact construction. Extensive set of alarms. User selectable clock sources. Support fax and data modem @ upto 33.6Kbps data rates. Slide 2

3. Orion Telecom Networks Inc. 2005 Satellite Communications Digital Mobile Radio Secure Communications Cellular Telephony and PCS Voice Multiplexing Applications Long Distance Telephony Prepaid Calling Card Service Call Center Applications Rural Telephony Voice Mail VCL-LD, T1 Voice Compression Equipment Slide 3

4. Orion Telecom Networks Inc. 2005 Support for multiple signaling platforms including CAS R2, PRI ISDN and SS7 # Signaling. Echo cancellation: Echo Canceller card cancels echo up to 128ms. T1, 24 voice channels in 256Kbps bandwidth (4, DS-0's ) for voice only application. T1, 24 voice channels in 384Kbps (6, DS-0’s) for voice, fax and data modem support. Ideal choice for satellite communications, digital mobile radios, cellular network, long distance telephony service providers (including pre-paid calling card operators), corporate customers for linking intercity voice networks, national and international call-center applications, and ISPs wishing to provide reliable long distance telephony service to their customers. Modular Architecture - reduces downtime - dual port per card. Scalable - Build as you grow. Transport over point-to-point satellite links and dedicated leased lines. Superior Voice Quality. Robust to Bit Errors & Background Noise. High Quality Low Data Rate Speech Coding. Forward Error Correction. Voice Activity Detection (VAD) / Comfort Noise Insertion. Single and Dual Tone (DTMF) Detection and Generation. Minimal algorithmic processing delay. DTMF detection and regeneration. Support fax and data modems @ upto 33.6Kbps data rates. Features VCL-LD, T1 Voice Compression Equipment Slide 4

5. Orion Telecom Networks Inc. 2005 PERFORMANCE Voice Quality Vs. Bit Rate Mean Opinion Score:MOS 4.0 3.5 3.0 2.5 2.0 1.5 1.0 VCL-LD, T1 Voice Compression Equipment Slide 5

6. Orion Telecom Networks Inc. 2005 Application of VCL-LD TM DCME International & Domestic Long Distance Telephony - A Fractional T1 Compressed @ 256 kbps Satellite / Leased Line T1, CAS R2 PRI ISDN (Euro ISDN) C7, SS7 Signaling T1, CAS R2 PRI ISDN (Euro ISDN) C7, SS7 Signaling PSTN Switch PSTN Switch VCL-LD VCL-LD, T1 Voice Compression Equipment Slide 6

7. Orion Telecom Networks Inc. 2005 Long Distance Application - B PRI ISDN (30B+D) or T1 C7/SS7 Signaling 256K Compressed T1 Fractional T1 Format 256K Compressed T1 Fractional T1 Format Satellite link PRI ISDN (30B+D) or T1 C7/SS7 Signaling T1E1 VCL-LD T1 DCME VCL-LD T1 DCME VCL-LD, T1 Voice Compression Equipment Slide 7

8. Orion Telecom Networks Inc. 2005 Call Center Application T1, CAS R2 PRI ISDN (Euro ISDN) C7, SS7 Signaling Fractional T1 Compressed @ 256 kbps Satellite / Leased Line PSTN Switch Call Centre VCL-LD VCL-LD TM VCL-LD, T1 Voice Compression Equipment Slide 8

9. Orion Telecom Networks Inc. 2005 Long Distance Telephony 2 or Multiple T1’s - DCME Application Satellite link E1 T1 256K T1 VCL-LD T1 DCME 256K Compressed T1 Fractional T1 256K Compressed T1 Fractional T1 VCL-LD T1 DCME VCL-LD T1 DCME VCL-LD T1 DCME 256K Compressed T1 Fractional T1 256K Compressed T1 Fractional T1 256K VCL-LD T1 DCME VCL-LD T1 DCME VCL-E1 DACS 256K x “n” Value of “n” = number of compressed T1’s in Fractional T1 Format VCL-LD, T1 Voice Compression Equipment Slide 9

10. Orion Telecom Networks Inc. 2005 FRONT PANEL VIEW OF VCL-LD 19 inch Shelf The detailed equipment components of the VCL-LD are listed below: 1. One, VCL-LD, 19 inch shelf and Connectorized Backpanel 2. One, -48 VDC, Power Supply Card 3. One, T1, Echo Canceller Card (128 ms. echo cancellation) 4. One, T1, Interface Card, provides one uncompressed T1 interface and one compressed T1 interface. 5. DS-0, aggregate 10 compressed voice channels to a DS-0 (3 cards per system - maximum) 6. Voice compression card, Dual channel voice compression card, (12 cards per system - maximum) Voice Compression Cards DS-0 Card Voice Compression Cards DS-0 Card T1 Interface Card Echo Canceller Card Voice Compression Cards Power Supply Card VCL-LD, T1 Voice Compression Equipment Slide 10

11. Orion Telecom Networks Inc. 2005 Technical Specifications Digital Network (PSTN) Interface 2048 Kbps Telco - E1 Number of T1 Interfaces1 Maximum number of Voice Channels per T1 Interface24 ConformityG. 703 Frame StructureAs per ITU (CCITT) G.704 Framing OptionsD4, ESF (Selectable) PCM Sampling Rate8000 samples/ sec Encoding Law  Law as per ITU (CCITT) G.711 Bit Rate1544 Kbps ± 50 ppm CodeB8ZS, AMI (Selectable) Nominal Impedance100  balanced(75  unbalanced* - optional). Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 Khz) Permissible AttenuationUpto 18db max. (As per ITU-T 1.431) Jitter ToleranceAs per ITU (CCITT) G.823, ITU-T 1.431 Supported SignalingPRI (Primary Rate) ISDN Signaling (Q.931), SS7 Signaling/C7 Signaling Common Channel Signaling. Clock Synchronization Synchronization SourcesInternal Clock, or, Timing derived from the T1, link (Loop-Timed Clock) Default Option Internal Clock VCL-LD, T1 Voice Compression Equipment Slide 11

12. Orion Telecom Networks Inc. 2005 Digital Carrier Interface 256 Kbps (Fractional T1) Compressed - T1 (voice only application) Number of T1 Interfaces1 - Fractional T1 Interface @ 256Kbps Compressed T1,Number of DS-0s4 (First Four Time Slots) ConformityG. 703 Frame StructureAs per ITU-T G.704 Framing OptionD4, ESF (Selectable) Bit Rate1544 Kbps ± 50 ppm CodeB8ZS, AMI (Selectable) Nominal Impedance100  balanced (75  unbalanced - optional) Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 KHz Permissible AttenuationUpto 18db max. (As per ITU-T 1.431) Jitter ToleranceAs per ITU (CCITT) G.823 Power Supply Input DC voltage-48V DC ( nominal ) Range of input-40V to -60V DC Power ConsumptionLess than 20 Watts (at full load) -48VDC Input Voltage Reversal ProtectionProvided (Standard) 93VAC-267VAC, 47Hz-63Hz Auto-SensingOptional (External Supply) VCL-LD, T1 Voice Compression Equipment Slide 12

13. Orion Telecom Networks Inc. 2005 Digital Carrier Interface 384 Kbps (Fractional T1) Compressed - T1 E1 (voice, fax & data modem support @ upto 33.6Kbps Transmission) Number of T1 Interfaces1 - Fractional T1 Interface @ 256Kbps Compressed T1,Number of DS-0s6 (First Six Time Slots) ConformityG. 703 Frame StructureAs per ITU-T G.704 Framing OptionD4, ESF (Selectable) Bit Rate1544 Kbps ± 50 ppm CodeB8ZS, AMI (Selectable) Nominal Impedance100  balanced (75  unbalanced - optional) Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 KHz Permissible AttenuationUpto 18db max. (As per ITU-T 1.431) Jitter ToleranceAs per ITU (CCITT) G.823 Echo Canceller : Technical Specifications Provides voice echo cancellation of up to 128ms Conforms to ITU-T G.165 and ITU-T G.168 G.164 /G.165 disable tone detection Non-Linear Processor with Comfort Noise Insertion Narrow-Band Detector Eliminates long echo tail. VCL-LD, T1 Voice Compression Equipment Slide 13

14. Orion Telecom Networks Inc. 2005 Orion’s Products E1, Voice & Data Drop-Insert Multiplexer PRI ISDN (Q.931) Multiplexers E1 Intelligent Channel Banks E1 / T1 DCME (Digital Circuit Multiplication Equipment) - Voice Compression Equipment Thin Route DCME E1 / T1 Echo Cancellers E1 / T1 Digital Cross Connect T1 / E1 Converters E3, 34Mbps Multiplexer 34Mbps Optical Line Transmission Equipment (OLTE) STM 1 / STM 4 - SDH Equipment Remote Asset Management Systems Slide 14 VCL-LD, T1 Voice Compression Equipment

15. Orion Telecom Networks Inc. 2005 Thank you for your attention For more details visit us at our Web Site at http://www.oriontelecom.com 16810, Avenue of Fountains, Suite # 108, Fountain Hills, AZ 85268, U.S.A. Phone: +1 (480) 816-8672 Fax: +1 (480) 816-0115 E-mail: sales@oriontelecom.com Slide 15 VCL-LD, T1 Voice Compression Equipment